DL 2440 then UA 571 at Atlanta
Jacksonville → Atlanta → San Francisco
Timetable, Atlanta time
07:25DL 2440 from Jacksonville at the gate
07:00UA 571 to San Francisco leaves the gate
23 h 35 apart on the timetable, overnight
UA 571 leaves 23 h 35 after DL 2440 arrives on the timetable: more than half a day, so not a connection we count.